You can get some info on this by looking at previous people who got PhDs there. Where did they wind up? Do those positions appeal to you? Hopefully the prof can give you some of this sort of info.
If you want to be a prof then publication is high on the list of desirable features. A string of publications, especially in prestigious journals, especially if they get a lot of citations, is a good springboard to the tenure track. Some related issues are: Would you get to go to conferences? Does this prof have an "empire" in that several of his students have become profs? They might be your intro to an academic position after you finish. And they are great potential co-authors on interesting papers.
Also, ask about financial support. Are there teaching or tutoring jobs for PhD candidates? Can the prof support you from a grant? It's time for some polite but frank discussion on that subject.
If you want to go to industry, publications are important but not as important. In industry, solving a problem in a convincing manner is what you want. Having a reputation for finishing tasks is important. It's the "better mousetrap" issue and the "reliable employee" issue. And solving a problem that is at least in some way related to the current issues bothering the industry is especially good. Here, a related issue might be: Is it possible to do contract work for some industry while doing your PhD? Such a contract is a great introduction to the industry you might wind up working in.
So if this prof has industry ties, and you want industry, that's a plus. If he has academic ties and you want academe, that's a plus. And of course, if your desires are at odds with the prof's focus, that's a negative.